Pressure washers are valuable tools for cleaning a variety of surfaces, from driveways and decks to cars and siding. However, one common problem that frustrates many users is when the pressure washer simply won’t start. Whether it’s gas-powered or electric, troubleshooting why your machine isn’t starting can often be confusing. There are several potential causes, and understanding them will help you identify the problem quickly and take the right steps to fix it.
In this article, we’ll cover the most common reasons why your pressure washer might not start and offer simple, step-by-step solutions to help you get your machine back up and running.
Power Supply Issues
One of the most common reasons a pressure washer won’t start is a problem with its power supply.
For Electric Pressure Washers
If you’re using an electric pressure washer, the first thing to check is whether the machine is getting enough power. If your pressure washer is not starting, follow these steps:
Check the Power Cord: Inspect the power cord for any visible damage. If the cord is frayed or broken, the machine will not receive electricity.
Check the Outlet: Ensure that the outlet you’re using is functioning properly. You can plug in another appliance to test the outlet.
Reset the Circuit Breaker: Sometimes, the circuit breaker or fuse connected to the outlet can trip. Check your breaker box and reset the breaker if necessary.
Use a Proper Extension Cord: If you’re using an extension cord, make sure it’s the right one. Electric pressure washers require heavy-duty extension cords, ideally 12-gauge, to handle the power requirements.
For Gas-Powered Pressure Washers
Gas-powered models are different, and if your pressure washer is not starting, it’s often due to fuel-related issues:
Check the Fuel Level: Ensure that your gas tank has enough fuel. An empty or low fuel tank is a common reason for a gas-powered pressure washer to not start.
Use Fresh Gas: If you haven’t used the pressure washer in a while, the fuel may have gone stale. Gas can degrade over time, leading to starting issues. Drain old gas and refill the tank with fresh gasoline.
Engine Problems
If the power supply is not the issue, your pressure washer may be having engine problems.
For Gas-Powered Pressure Washers
Gas pressure washers rely on a well-functioning engine to start. The following problems are common when the engine is not functioning properly:
Spark Plug Issues: A worn-out or damaged spark plug can prevent the engine from igniting. Remove the spark plug and inspect it for dirt or corrosion. Clean the plug with a wire brush if it’s dirty, or replace it if it’s damaged.
Choke Position: Make sure the choke is in the correct position when starting the engine. The choke should be set to “closed” when starting a cold engine and switched to “open” once the engine is running.
Oil Levels: Many gas pressure washers have a low-oil sensor that prevents the machine from starting if the oil level is too low. Check the oil level in the engine and refill if necessary.
Water Flow Issues
Pressure washers depend on a steady water supply to operate properly. If your pressure washer is not starting, the water supply may be blocked or insufficient.
Check the Water Supply
Ensure that the pressure washer is connected to a reliable water source. The water supply should be turned on fully, and there should be no kinks or leaks in the hose. Without enough water pressure, the machine will not function correctly.
Inspect the Inlet Filter
Pressure washers have an inlet filter that prevents dirt and debris from entering the pump. Over time, the filter can become clogged, restricting water flow. Disconnect the hose and inspect the filter. Clean or replace it if you notice any blockage.
Pump Problems
The pump is a key component in pressure washers, and if it’s not working properly, your machine may not start or may fail to build pressure.
Air in the Pump
One common issue is air trapped in the pump. Air can prevent water from flowing properly through the pressure washer, which may cause it to not start. To release the air, disconnect the high-pressure hose, and run water through the machine for a few minutes. This will help purge the air and allow the pump to work correctly.
Pump Damage
If the pressure washer still won’t start or isn’t building pressure, the pump may be damaged. Inspect the pump for leaks, cracks, or any unusual noises. A damaged pump may need to be repaired or replaced by a professional.
Carburetor Issues
Carburetor problems are a frequent cause of gas-powered pressure washers not starting.
Dirty Carburetor
Gasoline can leave a residue in the carburetor, especially if the machine hasn’t been used for a while. This residue can block fuel from reaching the engine. To fix this, you’ll need to clean the carburetor. You can try using a carburetor cleaner to dissolve any deposits, or you may need to remove and clean the entire carburetor manually.
Stale Fuel in the Carburetor
If stale fuel is clogging the carburetor, it can prevent your pressure washer from starting. Drain the fuel tank and clean out any fuel that may have collected in the carburetor. Refill the tank with fresh gas and try starting the machine again.
see also: How to Clean Carpet with a Pressure Cleaner?
Safety Switch and Valve Issues
Some pressure washers come with safety switches or valves that can prevent them from starting if not properly engaged.
Safety Lock
If your pressure washer has a safety lock feature, check to see if it is engaged. Some models won’t start unless this lock is disengaged.
Unloader Valve Problems
The unloader valve is responsible for regulating the pressure in your washer. If this valve is stuck or malfunctioning, the machine may not start. The unloader valve may need to be adjusted or replaced to get the pressure washer working again.
Cold Weather Effects
Cold weather can cause starting issues for pressure washers, especially gas-powered ones.
Fuel Freezing or Gelling
In extremely cold temperatures, fuel can thicken or freeze, which can prevent the pressure washer from starting. Store the machine in a warmer environment and allow the fuel to thaw before attempting to start the engine again.
Cold Engine Start
In cold weather, engines may have trouble starting because the oil thickens. Try pulling the starter cord a few extra times to warm up the engine before engaging the choke.
Conclusion
There are many reasons why a pressure washer might not start, from power supply problems and fuel issues to engine and pump malfunctions. By systematically checking each component—such as the power supply, fuel, water flow, and the condition of the pump and carburetor—you can often diagnose the issue and take the appropriate steps to fix it.
Regular maintenance is crucial to keeping your pressure washer running smoothly. Ensure you use fresh fuel, clean the filters, and store the machine properly during the off-season. If you encounter more complex issues, it may be best to consult a professional for repairs.